Collimation of horizontally polarized shear waves by means of ridge grating supported Love modes

We present an evidence of the beaming phenomenon regarding inplane elastic waves in the context of the enhanced acoustical transmission. Our simulations found emission of a long-range beam through a single subwavelength channel surrounded by periodic structures. The space-time spectral analysis of the inplane displacement field revealed that Rayleigh surface waves principally mediate the energy transmission that leads to the formation of beams. Consequently, we suggest a resonance condition for the beaming in terms of the ratio of the wavelength to the period of the structures. Our findings will be expected to foster the application to ultrasonic devices.

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Beaming of inplane elastic waves through a subwavelength channel with periodic corrugations

Takahashi

Kuriyama

Matsumoto

2012

Applied Physics Letters

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A collimated focused ultrasound beam of high acoustic transmission and minimum diffraction achieved by using a lens with subwavelength structures

Lin

Guo

et al. 2015

Applied Physics Letters

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An acoustic focusing lens incorporated with periodically aligned subwavelength grooves corrugated on its spherical surface has been developed. It is demonstrated theoretically and experimentally that acoustic focusing achieved by using the lens can suppress the relative side-lobe amplitudes, enhance the focal gain, and minimize the shifting of the focus. Use of the lens coupled with a planar ultrasound transducer can generate an ultrasound beam with enhanced acoustic transmission and collimation effect, which offers the capability of improving the safety, efficiency, and accuracy of targeted surgery implemented by high intensity focused ultrasound.

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Extraordinary transmission without resonance: Probing enhancements in acoustic transmission and energy density in hole arrays acting as a metasurface

Bok,

Park,

Maznev

et al. 2023

Phys. Rev. B

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Collimation of horizontally polarized shear waves by means of ridge grating supported Love modes

Cited by 4 publications

References 19 publications

Beaming of inplane elastic waves through a subwavelength channel with periodic corrugations

Beaming of inplane elastic waves through a subwavelength channel with periodic corrugations

A collimated focused ultrasound beam of high acoustic transmission and minimum diffraction achieved by using a lens with subwavelength structures

Extraordinary transmission without resonance: Probing enhancements in acoustic transmission and energy density in hole arrays acting as a metasurface

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